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## OVERVIEW OF KEY VARIABLES IN DATASET
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Hoffmann, Roman; Abel, Guy; Muttarak, Raya, Malpede, Maurizio, Percoco, Marco 2024, 
Replication data and code for: Drought and aridity influence internal migration worldwide, 
https://doi.org/10.7910/DVN/QVLBGN

corresponding author: Roman Hoffmann, hoffmannr@iiasa.ac.at


* IDENTIFIER VARIABLES ------------------------------------------------------------------------------------------------

alpha3 				Country code
cntry_code 			Country code
cntry_name 			Country name
orig				Unique ID for subnational origin regions
dest				Unique ID for subnational destination regions
worldregion                   	World region
	
year    			Year of census                
year_cat10			Decade of census
year_cat5  			Five year time interval for census data collection


* CHARACTERISTICS OF ORIGIN - DESTINATION LINKS -----------------------------------------------------------------------

contig				Origin and destination region are adjacent
dist				Distance between origin and destination
mig_interval			Time interval of migration data collection (referring to past 5 or 1 year)


* MIGRATION VARIABLES -------------------------------------------------------------------------------------------------

flow                          	Total migration flow between origin and destination
flow_annual 			Annual migration flow: flow / mig_interval	
flow_out_rate_annual          	Annual outmigration rate: flow_annual/pop_origin
net                           	Net migration flows: Outmigration - immigration
net_annual                    	Annual net migration flows: net/mig_interval
net_rate_annual                 Annual net migration rate           


* ORIGIN-DESTINATION CHARACTERISTICS ---------------------------------------------------------------------------------
 
orig/dest_pop			Origin/destination population
orig/dest_area			Origin/destination land area
orig/dest_border		Origin/destination has border
orig/dest_landborder		Origin/destination has landborder
orig/dest_gdp_per_capita	Origin/destination GDP per capita
orig/dest_indgen_afaf 		Origin/destination share of agricultural employment	
orig/dest_urban			Origin/destination share of urban population


* COUNTRY-LEVEL VARIABLES --------------------------------------------------------------------------------------------

pop				Country population
grp_un_develop                	Development category of country
gini                         	Gini coefficient of country
country_gdp_pc 			GDP per capita of country
country_agr_landshare		Agricultural landshare of country
dest_no                       	No of subnational regions in country
aridity_cat			Baseline aridity level in country in period 2000-2020 


* CLIMATE INDICATORS -------------------------------------------------------------------------------------------------

orig_ | dest_			Climate indicator for origin or destination region

ai_ | pdsi_ | spei03_ | spei12_	Drought and aridity indicator

lead_				Indicator refers to period in the future

mean | min			Indicator captures average dryness levels or most extreme dryness levels in time period

mean10 | 5 | 20 ...		Time window in years before the census date

_stan1				Climate indicators standardized at subnational regional level
_stan2				Climate indicators standardized at country level
_stan3				Climate indicators standardized at worldregion level
_stan4				Climate indicators standardized at global level

